Historical on-time performance
Chicago to Denver
Flights on ORD–DEN arrive on time 73% of the time over the last 12 months.
based on 5,979 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- Frontier AirlinesOn-time77%Medianon timep9060 minCancel1.1%Flights189
- United AirlinesOn-time77%Medianon timep9045 minCancel0.9%Flights3,701
- Envoy AirOn-time76%Medianon timep9040 minCancel0.0%Flights108
- Southwest AirlinesOn-time74%Medianon timep9050 minCancel0.8%Flights510
- American AirlinesOn-time65%Medianon timep9080 minCancel1.6%Flights1,471
Why flights run late
Delay causes
- Airline28%
- Weather4%
- Air traffic (NAS)23%
- Late aircraft44%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline20%
- Weather72%
- Air traffic (NAS)8%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 64 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly ORD → DEN
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 86% on time.
- Mornings86% on time · p90 20 min · 5,363 flights
- Middays82% on time · p90 30 min · 4,645 flights
- Afternoons70% on time · p90 65 min · 3,327 flights
- Overnights65% on time · p90 70 min · 2,969 flights
- Evenings64% on time · p90 75 min · 2,651 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 78% on time.
- Tuesdays78% on time · p90 45 min · 2,618 flights
- Saturdays77% on time · p90 45 min · 2,460 flights
- Wednesdays77% on time · p90 45 min · 2,639 flights
- Mondays77% on time · p90 50 min · 2,803 flights
- Sundays75% on time · p90 60 min · 2,808 flights
- Thursdays75% on time · p90 55 min · 2,799 flights
- Fridays73% on time · p90 50 min · 2,833 flights
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